How to call an unpackaged class under a packaged class

zj2009i

Bangdingxia

独舞明夕

You should go to the vendor to ask for a packaged class. Use reflection. If the vendor updates the API in the future, you will be in trouble. All parts must be rewritten.



Support, this is the root!

shamerock

Learn it!

northkorea

Shouldn't it work?
Comrades, there is no way to directly call a packageless class with a packaged class, because the packageless class is placed in a hidden namespace.
Use reflection to call it.

Suppose there is a non-package class that needs to be called:

[code=Java]public class Main {
    public void hello() {
        System.out.println("hello");
    }
}[/code]

Use reflection to call the hello() method of this packageless class:

[code=Java]package hello;

import java.lang.reflect.*;

public class Hello {
    public static void main(String[] args) throws Exception {
        Class clazz = Class.forName("Main");
        Object o = clazz.newInstance();
        Method m = clazz.getDeclaredMethod("hello");
        m.invoke(o);
    }
}[/code]

wc31415

Hit the jar package!
Just import the jar package you built in the directory of your original project to pull it

magicman12

Refer to how to reference other packages in eclipse. Just apply it in the build path of the project.

citizen612

So JAVA does not recommend packageless classes

exsquall

Study, hey